And there is more: the scaling of the Sun & scattering media. Those 
should be coupled. For that do this:


#declare MyScale = <200, 200, 10>;

On the scattering media line do this (example):

         scattering {
           1, <.1,.5,1>*5000/MyScale
           extinction  1.50
         }

And in the object block for the Sun, set: scale MyScale.

In that way you can scale the Sun however you want without changing the 
visual aspect of the media. One word of caution: I always am weary of 
asymmetrical media scaling. So, I personally prefer to use <200,200,200> 
instead of <200,200,10> when I can avoid it.

With all this I have not yet got the Uberpov aspect in official POV, but 
I am working on it :-)

Thomas

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